Huge travel disruption is expected and thousands of homes are without power after the UK was hit by Storm Isha.
The whole country was battered by high winds and heavy rain from Sunday evening into Monday morning, with gusts reaching more than 100mph.
The Met Office said that Isha has now passed but a yellow warning for wind remains in place across all of England, Northern Ireland, Scotland and Wales until midday on Monday, while further warnings have been issued for Tuesday and Wednesday.
Images from the aftermath of the storm showed trees on top of cars, fallen debris and large queues at train stations and airports.
In Scotland, an 84-year-old man has died after the Hyundai car in which he was a passenger collided with a tree on the A905 Beancross Road in Grangemouth at about 11.45pm on Sunday.
Police said he was pronounced dead at the scene, while the other occupants of the vehicle were not injured.
Transport Scotland said a gust of 107mph was recorded on the Tay Bridge.
In Co Antrim in Northern Ireland, three trees that make up the Dark Hedges site, made famous for its appearance in the TV show Game Of Thrones, were felled.
Mervyn Storey, chairman of the Dark Hedges Preservation Trust, said: “It looks like there are three trees down.
“We have had people out since dawn trying to clear the road. There are a number of other trees down in the area as well."
There were 45,000 people in Northern Ireland left without power, many of them overnight, while travellers have been stuck in airports for up to 10 hours after flights from Belfast were cancelled.
Electricity North West said almost 8,000 homes had lost power in the area it covers in England, with expected restoration times pushed back to 5pm on Tuesday.
Fallen trees have affected transport, with Traffic Scotland reporting stretches of the M9 and M74 were among roads closed throughout the night, while the A1 southbound was closed at Thorntonloch due to an overturned lorry.
High winds forced the closure of the Tay Road Bridge, M48 Severn Bridge and the A66 in Durham and Cumbria between the A1(M) and the M6, while the Humber Bridge, A19 Tees Flyover and A628 Woodhead Pass in Derbyshire were among stretches closed to high-sided vehicles.
ScotRail services have been suspended since 7pm on Sunday and are not expected to resume until around noon on Monday as dozens of lines are closed due to fallen trees and flooding.
An entire greenhouse was blown on to the train tracks at Westgate-on-Sea, near Ramsgate, Kent.
Southeastern Railway said: "This is the greenhouse that is currently blocking the line at Westgate-on-Sea.
"If you live near the railway, please do check that items in your garden are as secure as possible in stormy weather."
A Network Rail spokesman said: “Hundreds of engineers are already out, armed with chainsaws and cherry pickers to remove and repair.
“Once done, route-proving trains will be dispatched before passenger services can restart.
“It’s been a wild night, but passengers and railway staff have been kept safe and we will work tirelessly to get the railway back on its feet as quickly as we can.”
Network Rail said the remains of a garden shed were blown on to the line at Bellgrove station in Glasgow and a small fire broke out after a tree fell on overhead wires in Gartcosh, Cumbernauld.
East Midlands Railway has said delays and alterations to its services are “likely”, while no LNER trains will run north of Newcastle until noon.
Meanwhile, air traffic control restrictions are in place, leading to flight cancellations and causing some planes to divert.
National Air Traffic Services told PA: “Due to adverse weather conditions across the UK, temporary air traffic restrictions are in place. Restrictions of this sort are only ever applied to maintain safety.
“Our teams are working closely with airports and airlines to minimise disruption. Passengers should check the status of their flight with their airline.”
Someone was struck by falling debris after scaffolding became dislodged in Belfast. They were treated at the scene by emergency services.
The Met Office said its highest recorded wind speed during Storm Isha was 99mph at Brizlee Wood in Northumberland, with gusts of 90mph at Capel Curig in Snowdonia on Sunday.